Paper bag



Patented Nov. 2, 1926.

" UNITED .STATES PATENT orificE;

- A JOSEPH W. TAGGART, OE WATERTOWN, NEW YORK, AssTGNoE lro TAGGAmBROTHERS i COMPANY, INC., oF WATEETOWN, NEW YORK, A'COEPOEATION on NEWYoax.

PAPER BAG.

appneauon mea Marcas, 1925-. serial Nn. 13,244. v

'This invention relates to aper bags in general, and has especial reerence to the production of relatively large -heavy and coarse bags that4are commonly made from manila rope and other stock""fro m which strongpaper bags are made, and are usually employed for packing coal, cement,plaster,

lour and various other pulverized products. The object ofthe presentinvention is to improve the construction of ,paper bags of the classnamed, and particularly the meth-A od of forming and closing thel bottomends of the bag, which are usuall made from prepared tubular stock,where y a more ef-" certain portions of the bottom end of the' tubularblanks, and then to crease the opposite side portions adjacent theslits, in a manner to eliect the substantial overlapping of theseveralseries of bottom iaps, where foi'- merly but one seriesof flapshave been overlapped. A further object is to apply the adhesive, bywhich the .lap-joints are cemented and sealed, to the outer face ofthebottom after one series of flaps have been folded towards each other,andwhile the other series of flaps arel still extended, the zone of saidadhesive being elongated, and the linear dimension of said zone beingdisposed in the line 'of the longitudinal axis of the tube, whereby thesaid adhesive may be applied at one operation, to the correspondingportions of. both series of flaps, for effecting a powerful seal of theprimary, as well as the se'condary'joints of the bottom, when all of I-said iiaps are finally folded. And a particular object is to provide abag ofv the class suitable for packing and transporting carbon-black,and similar extremely light and iiul'l'y materials, whose particles 4areas light and as searching as air, and are therefore liable toescapethrough the smallest gaps or openings-in the joints, during thehandling ofthe 'filled bags.

I attain these objects by the means set forth in the detaileddescription which follows, andas illustrate-d bythe accompanyingdrawing, in which- Figure 1 is a plan view'of la prepared tu- A bularblank, from which my improved bag 1 is made showing by dotted-lines thecreases by which the several bottom end flaps are formed. Fig. 2 isy anedge view of the tube;

showing the bottom end partially folded..

Fig. 3 is a front.l face view of the tube shown in Fi 2; showingtheopposite lateral flaps folde 'inwardly and 'i substantially overlapped-in the line of the longitudinal center of the tube; the oppositelyarranged side flaps .beingl extended; also showing the elongated shadedzone which represents the adhesive'. the side flaps folded towards eachother, for covering the lap-'joint of the lateral flaps; also showingthe overlapping of the side flaps which adhere to each other as Well asto the lateral flaps. Fig. 5 is an edge view of the bag shown in Fig. 4.Fig. 6 is a view of the bottom end, taken in the direction of ive -pingof the lateral flaps. Fig. 7 is a broken A I the arrow in Fig.- 3;showing the overlap- Fig. 4 is .asimilar view, showing plan view of amodified construction, showing the lugs ofthe side flaps foldedinwardly'upon Athe joint of the lateral fla s prior to the applying ofthe side flaps are secured.. d ig'. 8 is a broken edge view of theAmodified construction illustrated in Figure 7." Y

In the drawing, 2 represents the tubular g5 blank from which the bag isformed, and comprises front and rear sides 22", which are joined blateral folds 2b, the side 2 being forme by overlapping similar laterofthe tube being disposed substantially in the line of the longitudinalaxis ofthe tube,

asteby'w ich the and being 'suitably pasted, in a well-known manner. 3represents the top, and 4 the bottom end of the blank. Preparatory-toforming the usual bottom flaps, the end 4 is slitted longitudinally forproviding similar integral front and -rear lugs or tongues 2e-2, and thesaid end portion is also creased, as shown in Fig. l, for facilitatingthe subsequent angular Vfolding and overlapping of the portions of thetube that comprise the bottom of the completed bag,

as may be understood by viewing Figs. 1,

, d in Rother, and also overlaps the said margins,

a, a and e. After the tube 2 is slated andcreased as described, it isIfed into the usualv bottoming -machine (not shown), which initiallyspreads fin a well-known manner the open bottom, and then lfoldsthejffront and rear lateral triangular portions 'Q5-5'- on the. angularcreases for producing the diamond-shaped configuration, 'shown l'invFig. 3. This brings the corresponding'bottom end margins 4i--4aparallel to eachk as at 4b 'the said lap preferably .beinglocatedsubstantially in thev line of the longi- -tudinal seam 2", as shown inFigs. 3, 6 and 7. This leaves the lugs 2f-2f'extended beyond and in linewith the joints 2 and 4b. While the bottom end is still extended, as

- shown in Figs. 2 and 3, the tube is carriedv along by the machine, toa point where an adhesive, (see shaded portions of Figs. 3 and-7), isappliedpreferably in the form of an elongated zone or strip, as 7 whichcoincides with and preferably extends ylaterally 2 is again carriedforward in the machine,

andthe front side iap 8, which'comprises corresponding portions of theflaps 5-5, and is rendered foldable by the transverse and longitudinalarms of the 'crease ,8 of,

85- the front side 2- of the tube, is next folded inwardly upon, andpartially overlaps, the lateral flaps 5 5. after which the rear oropposite side flap 9, which comprises 'similar portions of the flaps 5-5and is foldable on the creases 9', is finally folded inwardly upon'theremaining portions of the lateral naps, and also upon'the side flap l 8,as best seen in Fig. 4. This completes the folding and sealing of thebottom of the bag. It will be understood from the foregoing that thelateral flaps 5--5,'as well as the side flaps 8-9, are all treated withthe adhesive 7, as shown in Figs. 3 and 7, and

when the side iaps 8 and 9 are folded, as shown in Fig. 4, the completeadhesion of all of the bottom parts is effected by the meeting of theasted portions of the sev- -eral flaps. and 1n a .manner to elfectuallyseal the'portion vof the joint 4", which lies between the creases 8 .and9(see Fig. 3)', as well as the portions of the said joint,

" which extends across the adjacent portions of the side'flaps. The lug2 also contributes its share to the'sealing of the joint 4", and both ofthe lugs (2"-2f) also perform a particular and valuable function in thatthey effect the sealing of openings .10, which occur at the basesoffsaid lugs` (seeFigs.

3 and 6), which might, except for the provision of Asaid lugs, gapeopen. The joint 4b being disposed well wit-hin the zone of theradhesive, more or less of the paste 7 enters between the overlappedmargins 4-41, and tends to seal saidjoint independently of the lsealingeffected by the sideflaps 8 and 9. This pasting land sealing of thejoints 4b is enhanced l somewhat by the serirating of the edgef-4, whichvgreatly increases the marginal contour that receives theadhesive. Inpractise, this serrated edge, byreason of the capillary action of thepaste, -is found to be effectively sealed before the side 4flaps arefolded.

In Figs. 7 and 8, the lugs 25--2f are shown folded inwardly upon theside flaps, for closing the open ends 10, before the linal pasting andfolding of the side flaps, 8

and 9. This modification, while necessitat.

ing one or more extra operations, has the merit of more effectivelysealing the overlapped ends 10 of the lateral flaps.

My invention is extremely simple, and can be applied to paper bagswithout any extra labor and cost, as compared with the old styles ormakes of bags, and the said improvement may be applied to tubular blanksthat have been previously made and stored away long enough for the mainsideA joints 2c to become dried and set, instead of performing thebottom-closing operations im' mediately after -the tubes have been'formed, as has been the custom heretofore.

Obviously some changes or modifications of the method and the resultingstructure of the bags may be made,without departing from the spirit ofthe invention, but I wish it to be understood that the essential andyvaluablev features of my invention, to which I llay particular claim inthis application, reside inthe slitting of the end margin 4-4 ofthe-tube 2, for providing the tongues 2"'-2f, and the provision of theangular creases 5a, which diverge from the bases of the saidtongues,.and by-Ineans of which the lateral portions 5 5 may be foldedin a manner to overlap the margins 4-4, for

eifectually closing and sealing the normal bottom embracing thediamond-shaped field, shown in Figs.l 3 and 7 in combination with theconstruction and arrangement of the `integral side fiaps 8 and 9, whichareadapted *to be folded and overlapped upon the joint 4b, in amanner-to effect a double seal, and at the same time suitablyreinforcing the bottom of the bag, at its'weakest points.

Havingthus described my invention, what I claim, iss A paper bagAcomprising a tubular blank having its front and back wall portions atits bottom end each provided centrally of its side edges'with a pair ofrelatively short closely arranged longitudinal slits forming similarrelatively narrow short tongues, the blank being formed with creasesdiverging from the bottom of said slits whereby the lateral portionsbetween said creases and the bracing the overlapped marginal portionsbottom end margins ma be ex ended 'and tions at'either side bein? foldedtransversely v1o folded towards each ot er an providingsubstantiallygpidwayo their length in overfor effecting the overlappingof t e bottom lapping relationl nponthe overlapped marmarginal edgeportions in the line of the ginal edge portions-and cemented vthereto llongitudinal axis of the blank for substan and to each other',saidtongues being first tially the full breadth of the expanded botfoldd inwardly upon and cemented to the 15 tom, and an adhesive applied 4tola zone emsaid folded lateral portions. i

In testimony whereof I affix my signature.

- JOSEPH-W, TAGGART.

and said tongues, said folded lateral por-

